tailieunhanh - Practical TCP/IP and Ethernet Networking- P56

Practical TCP/IP and Ethernet Networking- P56: The transmitter encodes the information into a suitable form to be transmitted over the communications channel. The communications channel moves this signal as electromagnetic energy from the source to one or more destination receivers. The channel may convert this energy from one form to another, such as electrical to optical signals, whilst maintaining the integrity of the information so the recipient can understand the message sent by the transmitter | Satellites and TCP IP 257 Figure Satellite classifications courtesy of Byte Publications ref. 1 The important issues with the satellite system are the distance in which it orbits the earth and the radio frequency it uses. This impacts on the delay in data transfer the latency and the power of the signal and the data transfer rate. The various satellite bands can be listed as per the tables below. These tables have been sourced from reference 1 . 258 Practical TCP IP and Ethernet Networking What the Band Names Mean Band Name Frequency Range HF-band MHz VHF-bsnd 50-146 MHz Pb and GHz UHF-band GHz L-band 1 GHz FCGi digitalradio GHz S-band GHz C-band Downink GHz Uplink GHz X-baid Dawnink GHz Uplink 7900-8395 GHz Ell-band Europe Downink FSS GHz DBS GHz Telecom GHz Uplink FSS and Telecom GHz DBS GHz Kn-band Amsri a Downink FSS GHz DBS GHz Uplink FSS 14J000-14500 GHz DBS 17300-17800 GHz Ka-band Ebuddy 18-31 GHz Table Frequency allocation Satellite System Overview System type Frequency bands Applications Terminal Type size Examples Fixed satellite service C and Ku Video delivery. VSAT news Gathering Telephony 1-meter and larger fixed earth station Hughes Galaxy GE American Loral Skynet Intelsat Direct broadcast satellite Ku Direct- to-homc Vidco audio fixed earth station DirecTV EchoStar USSB Astra Mobile Satellite GEO L and S Voice and low-speed data to mobile terminals Laptop computer anten a-mounted but mobile Inmarsat AMSC TMI. ACES Big LEO Lands Cellular telephony. Data paging Cellular phone and pagers fixed phone booth Iridium Global Star ICO Little LEO P and below Position location Tracking Messaging As small as a packet of cigarettes1 and omnidirectional OrbComm. E-SAT Broadband GEO Ka and Ku Internet access. Voice video data 20-cm fixed Hughes .

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